Present and Prospective Accounting Pronouncements Cumulative Effect of changes due to adoption of ASU 2014-09 and 2018-02 (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables, net of allowance of doubtful accounts	$ 143.5			$ 142.5
Inventories	284.4			259.1
Deferred tax asset	2.9			2.5
Retained earnings	1,613.9			1,280.1
Accumulated comprehensive loss	$ (148.0)	$ (147.3)		$ (122.1)	$ (129.4)	$ (140.8)	$ (137.2)
Balance upon adoption [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables, net of allowance of doubtful accounts			$ 120.8
Inventories			274.9
Deferred tax asset			4.0
Retained earnings			1,292.4
Accumulated comprehensive loss			(138.8)
Accounting Standards Update 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables, net of allowance of doubtful accounts			(21.7)
Inventories			15.8
Deferred tax asset			1.5
Retained earnings			(4.4)
Accumulated comprehensive loss			0.0
Accounting Standards Update 2018-02 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Receivables, net of allowance of doubtful accounts			0.0
Inventories			0.0
Deferred tax asset			0.0
Retained earnings			16.7
Accumulated comprehensive loss			$ (16.7)